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Q.

Which one of the following statement is not true ?

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a

oxides of sulphur, nitrogen and carbon are the most wide spread air pollutant

b

pH of drinking water should be between 5.5 - 9.5

c

concentration of DO below 6ppm is good for the growth of fish

d

clean water would have a BOD value of less than 5ppm

answer is C.

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Detailed Solution

dissolved oxygen in water is very important for aquatic life . If the concentration of dissolved oxygen of water is below 6 ppm, the growth of fish gets inhibited.
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